chore(react-a11y): make accessibility-ci task not hang
chore(react-a11y): make accessibility-ci task not hang

The `accessibility-react-a11y` task takes a minimum of `timeoutInMs`
amount of time to complete. When the timeout was set to `20000`, the
task would always take 20 seconds to complete, even though phantom had
finished much earlier.

[#99344118]

sjolicoeur/pivotal-ui,CanopyCloud/pivotal-ui,npm/pivotal-ui,CanopyCloud/pivotal-ui,npm/pivotal-ui,sjolicoeur/pivotal-ui,CanopyCloud/pivotal-ui,pivotal-cf/pivotal-ui,sjolicoeur/pivotal-ui,sjolicoeur/pivotal-ui,pivotal-cf/pivotal-ui,npm/pivotal-ui,pivotal-cf/pivotal-ui